Underwriter keeps finding issues day of closing

[Grant Cox]

I've been under contract on my property since June 25th, and underwriting received all of their info on July 1st. They then wait until July 23rd to tell me that they want me to be employed in my field for a year before final approval, closing was supposed to be the 26th, thankfully the seller accepted a continuance until August 19 as I would pass the 1 year mark on the 14th. The 16th everything is good. On the 19th now the credit bureaus didn't all show up and we were forced to push it back another day because the scores didn't show until after my original  closing time. Now today on the 20th at 130pm with a close tike of 3 pm, the underwriter decides that they don't like that because I'm so young and so fat have only been an authorized user on a credit card (having been renting and paying for utilities for a year though) and haven't been making the payments, that now I would need to have a cosigner (which doesn't really work since everyone I know have too many write offs) so now I'm in limbo while I wait to see if there's any other solutions. Does anyone have any advice for this? And how I could possibly not lose out on this deal this late into it? What makes it worse is that im supposed to be out of my current living situation on the 29th